... text messages sent to the owner.4, dual mode positioning: GPS + GSM positioning dual mode switch, let your car online, make sure ... alarm, cross-border alarm, power supply removed alarm)5, GPS antenna, GSM antenna built-in; And built-in battery, in no ... : < 10 metersSpeed precision: 0.3 m/s2, the GSM performanceFrequency: GSM 900/1800Maximum transmission power: 1 W3, the main technical parametersThe ...